CN110737046A

CN110737046A - light trap for manipulating silica microspheres

Info

Publication number: CN110737046A
Application number: CN201911144876.2A
Authority: CN
Inventors: 许田; 魏丹珠; 金永龙; 尹瑶瑶; 王超男
Original assignee: Nantong University
Current assignee: Nantong University
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-01-31

Abstract

The invention discloses an optical trap for manipulating silica microspheres, which comprises an asymmetric double-sided metal planar optical waveguide structure, wherein the optical trap comprises four glass plates, namely a thin glass plate, 2 sample glass plates and a glass substrate, the 2 sample glass plates are mutually matched, the middle of the sample glass plates is a hollow circle after splicing and used for depositing a gold film, the thin glass plates are coated with thin silver films, the glass substrate is provided with the gold film, and the gold film and the silver film are finished in an evaporation coating mode.

Description

light trap for manipulating silica microspheres

Technical Field

The invention particularly relates to light traps for manipulating silica microspheres.

Background

Light manipulation of nanoparticles and biological sample molecules is which is the topic of heat in optics in recent years light manipulation is indirect contact controls, avoiding damage to particles from direct contact controls, with technological advances, devices based on evanescent field light, such as optical fibers and planar optical waveguides, were emerging.

Disclosure of Invention

Object of the invention to solve the disadvantages of the prior art, the present invention provides light traps for manipulating silica microspheres.

The technical scheme includes that the light traps for manipulating the silicon dioxide microspheres comprise asymmetric double-sided metal planar optical waveguide structures which are four glass plates, namely a thin glass plate, 2 sample glass plates and a glass substrate, wherein the 2 sample glass plates are mutually matched, the middle of the sample glass plates is a hollow circle after being spliced and used for placing a gold film, the thin glass plate is covered with a thin silver film, the glass substrate is provided with the gold film, and the gold film is formed by an evaporation coating mode.

Preferably, the four glass plates are combined by means of optical cement, the size of the whole device is 10mm by 15mm, and the four glass plates are subjected to series of sanding and polishing to reach the smoothness and parallelism required by the optical cement, so that the successful optical cement is ensured.

As an optimization: the asymmetric double-sided metal planar optical waveguide structure can couple light with various different incident angles into the waveguide layer, the optical field generates standing wave oscillation on the waveguide layer, nodes and antinodes appear, the optical field intensity at the antinodes is high, and the optical field at the nodes is weak; the light intensity difference is generated at the place of the light field intensity, so that the nano particles can be controlled, and the control of the nano particles is realized.

As an optimization: the thickness of the thin silver film is 30 nm.

As an optimization: the thickness of the thin glass plate is 0.3 nm.

As an optimization: the thickness of the sample glass plate is 0.7 nm.

As an optimization: the thickness of the gold film is 300 nm.

The invention provides asymmetric double-sided metal planar optical waveguide structures, which are simple in design, easy to control and low in cost, and similar to multimode optical fibers, the structures can couple light with various different incident angles into a waveguide layer, a light field generates standing wave oscillation on the waveguide layer, nodes and antinodes are generated, the intensity of the light field at the antinodes is low, the intensity of the light field at the nodes is low, and the light difference is generated at the positions of the intensity of the light field, so that nanoparticles can be controlled, and the control of the nanoparticles is realized.

The evanescent field and the oscillating field are optically coupled, wherein the evanescent field only corresponds to incident angles, and the oscillating field can correspond to an infinite number of incident angles, so that the condition for manipulating the nanoparticles by using the evanescent field is more rigorous, and the optical waveguide of the oscillating field can more easily grasp the nanoparticles.

Drawings

FIG. 1 is a schematic diagram of an asymmetric double-sided metallic optical waveguide structure according to the present invention;

fig. 2 is an optical coupling diagram of evanescent field and oscillating field optical waveguides of the present invention, wherein: (a) an evanescent field; (b) an oscillating field;

fig. 3 is a schematic diagram of light manipulation of the present invention, and the inset is an experimental diagram.

Detailed Description

The embodiments of the present invention are described as only a partial embodiment rather than a complete embodiment, and all other embodiments obtained by those skilled in the art without inventive faculty are within the scope of the present invention.

Examples

As shown in figure 1, kinds of light traps for manipulating silica microspheres comprise an asymmetric double-sided metal planar optical waveguide structure which comprises four glass plates, namely a thin glass plate, 2 sample glass plates and a glass substrate, wherein the 2 sample glass plates are mutually matched, the middle of the sample glass plates is a hollow circle after splicing and used for placing a gold film, the thin glass plate is coated with a thin silver film, the glass substrate is provided with the gold film, and the gold film is formed by an evaporation coating mode.

In this embodiment, the four glass plates are combined by means of optical cement, the size of the whole device is 10mm by 15mm, and the four glass plates are subjected to series of frosting and polishing to reach the required smoothness and parallelism of the optical cement, so as to ensure successful optical cement.

In this embodiment, the thickness of the thin silver film is 30nm, the thickness of the thin glass plate is 0.3nm, the thickness of the sample glass plate is 0.7nm, and the thickness of the gold film is 300 nm.

The structure of the invention is similar to a multimode fiber and can couple light with different incidence angles into a waveguide layer, a light field generates standing wave oscillation on the waveguide layer, a node and an antinode are generated, the light field intensity at the antinode is weak, the light field intensity at the node is weak, and the light field intensity is poor, so that nanoparticles can be controlled and controlled, as shown in figure 3, a 532nm laser respectively passes through a polarizer, a diaphragm and a small hole in a light screen and is incident into a double-sided metal optical waveguide device, and then is reflected to the light screen to generate circles of circles of light spots.

Optical coupling of evanescent field and oscillating field as shown in fig. 2, the evanescent field only corresponds to incident angles, and the oscillating field can correspond to an infinite number of incident angles, so the condition for manipulating nanoparticles with evanescent field is more severe, and the optical waveguide of our oscillating field can more easily grasp nanoparticles.

Claims

The optical trap for manipulating the silicon dioxide microspheres is characterized by comprising an asymmetric double-sided metal planar optical waveguide structure which comprises four glass plates, namely a thin glass plate, 2 sample glass plates and a glass substrate, wherein the 2 sample glass plates are mutually matched, the middle of the spliced glass plates is a hollow circle for placing a gold film, the thin glass plate is coated with a thin silver film, the glass substrate is plated with the gold film, and the gold film and the silver film are both finished in an evaporation coating mode.
2. The silica microsphere manipulation light trap of claim 1, wherein said four glass plates are combined by means of optical cement, the size of the whole device is 10mm x 15mm, and said four glass plates are ground and polished by series to achieve the required smoothness and parallelism of optical cement, thus ensuring successful optical cement.
3. The silica microsphere manipulating light trap of claim 1, wherein: the asymmetric double-sided metal planar optical waveguide structure can couple light with various different incident angles into the waveguide layer, the optical field generates standing wave oscillation on the waveguide layer, nodes and antinodes appear, the optical field intensity at the antinodes is high, and the optical field at the nodes is weak; the light intensity difference is generated at the place of the light field intensity, so that the nano particles can be controlled, and the control of the nano particles is realized.
4. The silica microsphere manipulating light trap of claim 1, wherein: the thickness of the thin silver film is 30 nm.
5. The silica microsphere manipulating light trap of claim 1, wherein: the thickness of the thin glass plate is 0.3 nm.
6. The silica microsphere manipulating light trap of claim 1, wherein: the thickness of the sample glass plate is 0.7 nm.
7. The silica microsphere manipulating light trap of claim 1, wherein: the thickness of the golden film is 300 nm.